Molybdic acid ionisation under hydrothermal conditions to 300 °C |
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| Authors: | Z Minubayeva TM Seward |
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| Institution: | a Institut für Mineralogie und Petrographie, Eidgenössische Technische Hochschule, ETH Zentrum, 8092 Zürich, Switzerland
b School of Geography, Environment and Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand |
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| Abstract: | This UV spectrophotometric study was aimed at providing precise, experimentally derived thermodynamic data for the ionisation of molybdic acid (H2MoO4) from 30 to 300 °C and at equilibrium saturated vapour pressures. The determination of the equilibrium constants and associated thermodynamic parameters were facilitated by spectrophotometric measurements using a specially designed high temperature optical Ti-Pd flow-through cell with silica glass windows.The following van’t Hoff isochore equations describe the temperature dependence of the first and second ionisation constants of molybdic acid up to 300 °C: |
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